Noun
a long swivel cannon formerly used by the navy
Source: WordNetFurthermore, in preparation for hostilities, the Boers had acquired around one hundred of the latest Krupp field guns, all horse-drawn and dispersed among the various Kommando groups, and several Le Creusot "Long Tom" siege guns. Source: Internet
A video of the lion, which is on the loose, was taken by Xander Mulligan after he saw the big cat on the Long Tom Pass. Source: Internet